What Do Dog Clipper Blade Numbers Mean? A Simple Guide

If you have ever looked at a wall of clipper blades and wondered how a higher number can leave a shorter coat, you are definitely not alone. Blade numbers make sense once someone explains them, but they are not especially intuitive when you are starting out.

I work with grooming tools every day, both in the salon and through The Groomers Shop. This is the straightforward explanation I wish every new groomer and confident home groomer had before choosing a blade.

The simple rule: higher blade number, shorter finish

With most detachable dog clipper blades, the number tells you the approximate cutting length. As the blade number increases, the hair left behind generally gets shorter. For example, a #4F leaves more coat than a #7F, while a #10 cuts shorter again.

Always check the manufacturer's stated cutting length because small differences can exist between brands. You can compare the current options in our A5 clipper blade collection.

Common dog clipper blades explained

#10 blade

A #10 blade leaves a close finish and is one of the most useful blades in a grooming kit. Groomers commonly use it for sanitary areas, paw pads and other detail work where a clean, controlled result is needed.

Because it cuts close, it needs careful technique. Keep the blade flat against the skin, avoid digging in with the teeth and regularly check the blade temperature. See the Groomtech SuperEdge #10 blade.

#7F blade

A #7F produces a short body finish. It is often chosen for practical, low-maintenance trims or coats that cannot safely be brushed out. The “F” means finish cut: the teeth are even across the blade and designed to leave a smoother finish.

This blade cuts quite short, so it is not the right choice for every coat or every area of the body. Extra care is needed around loose skin, tuck-ups, armpits and other folds.

#5F blade

A #5F leaves more coat than a #7F. It is a useful middle ground when you want a tidy, manageable body length without going extremely short. On a well-prepared coat, it can leave a smooth and balanced result.

#4F and #3F blades

These leave a longer, plusher finish. They work best on coats that have been bathed, dried straight and thoroughly brushed. A longer blade is not a shortcut through tangles: if the coat is not properly prepared, it will catch or leave an uneven finish.

What does “F” mean?

An “F” blade is a finishing blade. Its teeth are evenly spaced, unlike a skip-tooth blade. Finish blades are the more sensible choice for most groomers learning blade work because they create a smoother result and reduce some of the risks associated with wider-spaced teeth.

Wide blades versus standard A5 blades

Wide blades cover more surface area with each pass, which can improve efficiency on larger dogs and broad body areas. They require a compatible clipper and a little adjustment in handling because the blade extends further on each side.

Standard A5 blades are extremely versatile and fit many professional detachable-blade clippers. Before buying, always confirm that your clipper uses the A5 system.

When should you use a comb attachment?

If you want a longer, softer finish, a comb attachment fitted over the correct blade can be a better option. Comb attachments only work well when the coat is completely clean, dry, straight and free from knots. They will not glide through matting.

Three things matter just as much as blade length

• Coat preparation: Clean, fully dried and well-brushed coat gives the best finish.
• Blade temperature: Check against your inner wrist frequently and rotate blades during longer grooms.
• Blade condition: A blunt or damaged blade can drag, heat up and produce a poor result.

Our guide to keeping clipper blades sharp and effective explains the maintenance side in more detail.

My practical recommendation

Do not choose a blade based only on the finished length you like in a photo. Consider the dog's coat condition, skin, lifestyle and how much maintenance the owner can realistically manage. If you are new to grooming, get comfortable with safe handling and coat preparation before chasing speed.